I think understanding these in simple terms makes sense but once there is more jargon that might not be the case which is why they are doing it that way.

Hi! I think since it has a double negation both with cannot and without then it cancels out in the sense that both are negative and both are positive at the same time.

Plant life cannot survive without atmospheric carbon.

Hope that helps!

How do you know which notation to use, I think that is what is confusing me when translating it to Lawgic, because it makes sense without the notation for some but other I need the notation and it seems like I do not know which type to use.